X-ray Magnetic Circular Dichroism of Size-Selected, Thiolated Gold Clusters

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• 作者：Yuichi Negishi ; Hironori Tsunoyama ; Motohiro Suzuki ; Naomi Kawamura ; Michio M. Matsushita ; Koichi Maruyama ; Tadashi Sugawara ; Toshihiko Yokoyama ; Tatsuya Tsukuda
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：September 20, 2006
• 年：2006
• 卷：128
• 期：37
• 页码：12034 - 12035
• 全文大小：52K
• 年卷期：v.128,no.37(September 20, 2006)
• ISSN：1520-5126

文摘

We report herein the X-ray magnetic circular dichroism (XMCD) at the Au L_2,3 edges of a series of Au clusters protected by glutathione (GSH). The samples used here included Au_N(SG)_M with (N, M) = (10, 10), (15, 13), (18, 14), (22, 16), (25, 18), (29, 20), (39, 24) and a sodium gold(I) thiomalate (SGT) as a reference. Magnetic moments per cluster were found to be increased with size, whereas those per Au-S bond were nearly constant. This finding suggests that a localized hole created by Au-S bonding at the gold/glutathione interface, rather than the quantum size effect, is responsible for the spin polarization of gold clusters.